Air purifying unit



FIG. 1 is a perspective view of the air purifying unit according to the present design;

FIG. 2 is a top plan view;

FIG. 3 is a front elevation view;

FIG. 4 is a rear elevation view;

FIG. 5 is a bottom plan view;

FIG. 6 is a right side elevation view; and,

FIG. 7 is a left side elevation view. 

The ornamental design for the air purifying unit, as shown and described. 